check engine light VOLKSWAGEN T-ROC 2021 Owner´s Manual

-volt vehicle battery. Discharged 12-volt vehicle batteries can already freeze
at temperatures of around 0°C (+32°F). Frozen 12-volt vehicle batteries must be renewed
immediately.

NOTICE
Do not expose the 12-volt vehicle battery to direct daylight for an extended time.


NOTICE
Protect the 12-volt vehicle battery against frost if the vehicle is left standing for extended periods.
-volt vehicle battery can freeze and be destroyed as a result.

When you start the engine after the 12-volt battery has been totally discharged or after jump
starting, you may find that system settings (time, date, personal convenience settings and
programming) have been changed or deleted. Check and correct the settings as necessary once the
12-volt vehicle battery has been sufficiently charged.
Checking the electrolyte level of the 12-volt vehicle battery

Fig. 191 In the engine compartment: folding open the 12-volt vehicle battery cover.

Fig. 192 Battery window on the top of the 12-volt vehicle battery (illustration).
First read and observe the introductoryinformation and safety warnings⇒Introduction 
The electrolyte level of the 12-volt vehicle battery should be checked regularly in high-mileage
vehicles, in hot countries and in older 12-volt vehicle batteries. The 12-volt vehicle battery is
otherwise maintenance-free.
Vehicles with an auxiliary heater ⇒ Auxiliary heater and ventilation  are fitted with special vehicle
batteries. The electrolyte level of these 12-volt vehicle batteries cannot be checked for technical
reasons. Go to a qualified workshop to have the 12-volt vehicle battery checked.
Preparations
eparing the vehicle for working in the engine compartment ⇒ In the engine compartment .
⇒ In the engine compartment .
Checking the electrolyte level (12-volt vehicle batteries with battery window)
e for you to clearly see the colour indicator in the round
battery window on the top of the 12-volt vehicle battery ⇒ Fig. 192  (arrow). Never use naked
flames or glowing objects as a light source.
s according to the electrolyte level in the
12-volt vehicle battery.
Light yellow or without colourThe electrolyte level of the 12-volt vehicle battery is too low. The 12-
volt vehicle battery should be checked and replaced by a qualified workshop if necessary.BlackThe
electrolyte level of the 12-volt vehicle battery is correct.

WARNING
Any work on the 12-volt vehicle battery can cause serious chemical burns, explosions and electric
shocks.

Connecting the 12-volt vehicle battery
-volt vehicle
battery.
e cable and then the negative cable ⇒ .
Various indicator lamps may light up after the 12-volt vehicle battery has been connected and the
ignition is switched on. They will go out when you drive a short distance at a speed of approximately
15 – 20 km/h (10 – 12 mph). If the indicator lamps remain lit up, the vehicle should be checked by a
qualified workshop.
If the 12-volt vehicle battery was disconnected for an extended period, the system may not able to
calculate or correctly display the time when the next service is due ⇒ Instrument cluster . Observe
the maximum permissible service intervals ⇒ Service .
Automatic switch-off for electrical consumers
The intelligent vehicle electrical system management function automatically implements a range of
measures to prevent the 12-volt vehicle battery from discharging under high loads:


power supply to the 12-volt socket and the cigarette lighter may be interrupted temporarily
while the engine is being started.
The vehicle electrics management system cannot always prevent the 12-volt vehicle battery from
being discharged, for example if the ignition is left on over a long period with the engine off or the
side lights or parking lights are left on over a long period of time.
12-volt vehicle battery is discharged
gnition is switched on.

⇒ Auxiliary heater and ventilation .

WARNING
Incorrectly mounting the battery and using incorrect 12-volt vehicle batteries can cause short
circuits, fire and serious injuries.
-free and leak-proof 12-volt vehicle batteries that have the same
properties, specifications and dimensions as the factory-fitted 12-volt vehicle battery.

WARNING
A highly explosive mixture of gases is given off when the 12-volt vehicle battery is being charged.

-volt vehicle batteries should be charged only in well-ventilated spaces.
-volt vehicle battery. Discharged 12-volt vehicle batteries can
already freeze at temperatures of around 0°C (+32°F).
-volt vehicle battery must be replaced if it has ever been frozen.
the negative cable.

NOTICE
-volt vehicle batteries if the ignition is switched on or the engine is
running. Never use a 12-volt vehicle battery that does not correspond with the vehicle's
specifications. This can damage the electrical system or electronic components and electrical
malfunctions can occur.
to the 12-volt socket or to the cigarette lighter in order to charge the 12-volt vehicle battery. The
electrical system of the vehicle could otherwise be damaged.

12-volt vehicle batteries may contain toxic substances such as sulphuric acid and lead. Dispose of the
12-volt vehicle battery in accordance with the regulations.

Electrolyte can pollute the environment. Collect any service fluids that escape or are spilt and
dispose of them properly.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒Introduction 
Vehicle battery (12-volt)
The indicator lamp lights up red.
Fault in the alternator. The 12-volt vehicle battery will not be charged by the alternator while the
vehicle is in motion.
Switch off any electrical consumers that are not required. Inform a qualified workshop. Have the
electrical system checked.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up red and the text message 12 V battery not charging. Stop vehicle.
is displayed.

Fault in the alternator. The 12-volt vehicle battery will not be charged by the alternator while the
vehicle is in motion.
Switch off any electrical consumers that are not required. Inform a qualified workshop. Have the
electrical system checked.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up yellow and the text message 12 V battery low. Charge by driving.
is displayed.
The charge level of the vehicle battery is insufficient.
Recharge the 12-volt vehicle battery by driving the vehicle for an extended time.
The start/stop system cannot start the engine ⇒ Start/stop system .
and vehicle battery (12-volt)
The central warning lamp lights up red and the text message Replace 12 V battery. Workshop. is
displayed.
The vehicle battery condition is not ok.
Seek expert assistance and have the battery checked and replaced if necessary.
The start/stop system cannot start the engine ⇒ Start/stop system .
Wheels and tyres
Tyre monitoring system
Introduction
This chapter contains information on the followingsubjects:
⇒ Tyre Pressure Loss Indicator 
⇒ Troubleshooting for Tyre Pressure Loss Indicator 
The tyre monitoring system warns the driver when the tyre pressures are too low.
The tyre monitoring system monitors various parameters (for example, rolling circumference) of all
wheels using ABS sensors (indirect measurement).

WARNING
The intelligent tyre monitoring system technology cannot overcome the laws of physics, and
functions only within the limits of the system. Incorrect handling of the wheels and tyres can lead to
a sudden loss of pressure in the tyres, tread separation and even tyre blow-out.

The air compressor from the breakdown set may be operated from the 12-volt socket, even if the
power rating on the type plate of the air compressor exceeds the maximum power rating of the
socket.
Preparations
First read and observe the introductoryinformation and safety warnings⇒Introduction 
Checklist
Always carry out the following actions in the given order ⇒ :

If your vehicle has a flat tyre, park the vehicle on a firm and level surface at a safe distance from
moving traffic.

Switch on the electronic parking brake Parking and manoeuvring.

DSG® dual clutch gearbox: move the selector lever to position P DSG® dual clutch gearbox.

Switch off the engine and remove the key from the ignition.

Manual gearbox: select a gear Manual gearbox: selecting a gear.

Ask all vehicle occupants to leave the vehicle and stand at a safe distance away from moving traffic.

Switch on the hazard warning lights and set up the warning triangle In an emergency. Observe any
legal requirements.

Check whether the puncture can be repaired with the breakdown set The tyre sealant must not be
used:.

When towing a trailer: unhitch the trailer from the vehicle and park it properly .